php using preg_split

hello there,
how can I switch from split into preg_split with the function bellow
function loadAvg() {
	$load = exec("uptime");
	$load = split("load average:", $load);
	$load = split(", ", $load[1]);
	$load = $load[0];
	return $load;
}

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XK8ERAsked:
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ncooConnect With a Mentor Commented:
They I have now attached, sorry.
<?php
function loadAvg() {
	$load =  '08:44:05 up 42 days, 19:07,  1 user,  load average: 0.10, 0.17, 0.17';;//'exec("uptime");
	preg_match("/load average: ([^,]*?),/", $load,$m);
	return $m[1];
}
var_dump(loadAvg());

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ncooCommented:
It would be simpler and faster using preg_match, see code:
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